Keep up with the current tech or your are lost in the dust.
We're all kind of dust ultimately, anyway. Some of us enjoy being lost too.
As to RDAs no longer being made, vape shop employees being fools, ... I get reminded of something a manager in retail taught me once. "Don't expect anything from anyone. Then, when somebody actually does well you can be pleasantly surprised," he told me. We happened to be on the way to what me and him discovered as a somewhat favorite past time working there, dumpster surfing.
The trash pickup company would often "forget" or otherwise not come around to empty our store's dumpster for a week, or month. So, we got wooden pallets and tossed them onto the overflowing dumpster heaps, jumped up and down packing in the garbage. After that we figured we could get another two or three days worth of garbage into the dumpster. We would also feel a nice sense of stress relief after having done that.
I know it may seem my recollection of dumpster surfing doesn't relate to vaping, RDAs still being made, vape shop employees being fools. Where it relates though is in the nature of people as human beings. Last I checked our vaping gear is still inanimate objects requiring us to use to use it. People are people, and more or less could be said, ultimately though you have to realize the hard truths.
Stupidity, ignorance will always exist. Human beings are like that, fallible. We're also capable of getting to the moon and back, if that ain't a kick in the head. You don't get one without the other as fortunate or unfortunate as that might happen to be. A vaping shop employee tells me RDAs are not being made anymore? I smile the smile you as adults give children making mud pies and bringing them to you as you say, "gee, that's nice." I then walk out and from home shop any number of places on the Web & buy any RDA I desire.